now those keys are just providing easy access to a very luke rcrative crime using high- technology and in the end we are all on the hook. we all do it. swipe, pay, pump. but hidden behind anywhere a new bluetooth skimmer that can rip off your credit or debit information in seconds. police say the bluetooth technology makes it even harder to catch crooks because once they install devices they can nab the numbers off your card from as far away as 100 yards and they never have to return to recover the skimmer. what's more, this universal gas pump key is making it even easier for thieves to install these new skimmers. >> police tell us what they have uncovered four skimmers at this gas station. >> yeah. >> reporter: more on why this gas station owner won't talk to us in a moment. but first -- >> it's virtually indetectible. >> reporter: lieutenant mike sterner leads a team looking into dozens of bluetooth skimming cases from gilroy to fremont. >> it's in the millions of dollars very easily. but we're just touching the tip of the iceberg. >> reporter: in just the past two months investigato